MS11-A-E4A-F12-2A11-5EFHM Poclain Hydraulic Motor | 1687cc LSHT Radial Piston Moto

Product Overview

The MS11-A-E4A-F12-2A11-5EFHM is a low-speed high-torque radial piston hydraulic motor built on the Poclain MS/MSE11 platform, featuring a dual-displacement configuration within the MS11-2 series. The motor delivers a displacement range of 730 to 1,687 cc/rev, a rated pressure of 25 MPa (3625 PSI), a peak pressure of 400–450 bar (5800–6527 PSI), and a maximum output torque of 10,700 N·m (7,891 lb-ft) at speeds up to 200 rpm.

Engineered as a form-fit-function replacement for the MS11-2-D5E-M11-1920-58EFJM, this motor maintains identical mounting flange dimensions, shaft specifications, and port configurations, enabling drop-in interchangeability without any modification to the host machine’s mounting or hydraulic circuit. Every unit undergoes 100% simulated load testing on a dynamometer bench prior to shipment, validating torque output, volumetric efficiency, and control response against the original specification.

Key value propositions include: 100% interchangeability with original Poclain MS11 series motors in both complete-unit and spare-part dimensions; dual-displacement control enabling full-displacement (high torque) and half-displacement (high speed) operation via an integrated pilot valve; and modular architecture allowing integration of parking brakes, speed sensors, and flushing valves for application-specific customization.

Technical Specifications 

• Model: MS11-A-E4A-F12-2A11-5EFHM

• Series: Poclain MS/MSE11 (MS11-2 dual-displacement type)

• Motor Type: Low-speed high-torque radial piston motor (LSHT)

• Displacement Range: 730–1,687 cc/rev

• Rated Pressure: 25 MPa (3625 PSI)

• Peak Pressure: 400–450 bar (5800–6527 PSI)

• Maximum Output Torque: 10,700 N·m (7,891 lb-ft)

• Maximum Speed: 200 rpm

• Rated Speed: 100 rpm

• Maximum Power: 50 kW (67 HP) at standard displacement

• Control Method: Dual-displacement (full/half displacement switching); optional speed sensor

• Mounting: Shaft motor / wheel motor configuration

• Brake Options: Parking brake / service brake

• Rotation: Bi-directional

• Hydraulic Fluid: Mineral-based / biodegradable hydraulic fluids

Key Technical Advantages

1. Precision Radial Piston Pair with High Volumetric Efficiency

The MS11 series employs a multi-piston radial layout with precision-controlled clearance between the piston and cylinder bore, combined with a roller-type force transmission mechanism that minimizes friction losses in the piston pair. At the rated pressure of 25 MPa, volumetric efficiency exceeds 95%, ensuring stable torque delivery under low-speed heavy-load conditions and eliminating stick-slip or speed fluctuation caused by internal leakage.

2. Dual-Displacement Switching Mechanism for Multi-Speed Drive Capability

An integrated dual-displacement control valve enables switching between full and half displacement via an external pilot pressure signal. In full-displacement mode, the motor delivers maximum torque for heavy-load starting conditions; switching to half-displacement approximately doubles the output speed for no-load fast travel or light-load high-speed operation. This mechanism allows displacement changes without motor disassembly, enhancing overall machine adaptability across varying duty cycles.

3. Form-Fit-Function Interchangeability and Mounting Compatibility

This model maintains identical mounting flange dimensions, shaft extension specifications, port locations, and connection threads to the Poclain MS11-2-D5E-M11-1920-58EFJM, while also being compatible with Bosch Rexroth MCR series wheel motor mounting interfaces. Users can perform drop-in replacement using existing mounting brackets and hydraulic lines without additional machining or adapter components, significantly reducing downtime and retrofit costs.

4. Modular Design with Functional Extensibility

Based on the MS11 series modular platform, users can select parking brakes (spring-applied, hydraulically released), speed sensors (for closed-loop speed control), and flushing valves (for closed-circuit systems) according to machine requirements. Standardized interfaces between modules allow individual component replacement during maintenance or upgrade without affecting the motor’s core structure.

Application Areas

• Construction Machinery: Skid steer loader travel drive, mini excavator swing drive, motor grader wheel drive (compatible with SEM922 AWD and similar models)

• Mining Equipment: Coal mine drills, scraper conveyors, heavy-duty handling vehicle travel drives

• Agricultural Machinery: Combine harvester travel drives, cotton picker drive systems

• Municipal & Environmental Equipment: Road sweepers, refuse compactors, tunnel boring equipment

• Material Handling: Port crane travel mechanisms, beam carriers, forklift drives

• Marine & Offshore: Deck machinery, winch drives

Expert Maintenance Tips

Installation Guidelines:

1. Prior to installation, verify that the coaxiality deviation between the motor shaft and coupling does not exceed 0.05 mm to prevent premature shaft seal wear caused by excessive radial forces.

2. Fill the motor housing with clean hydraulic fluid during initial installation to prevent dry friction on piston pairs during startup.

3. The drain port (L port) must be connected separately to the reservoir with back pressure not exceeding 0.5 MPa; higher back pressure will damage the shaft seal and deform the housing.

Operational Maintenance Recommendations:

1. Inspect case drain leakage every 500 operating hours; normal leakage should remain below 2 L/min. A sudden increase indicates potential wear on piston pairs or the distribution plate.

2. Maintain hydraulic fluid cleanliness at NAS Level 9 or ISO 18/15 or better; replace hydraulic fluid and filter elements every 1,000 operating hours or annually, whichever comes first.

3. Periodically verify the dual-displacement switching valve response pressure. Conduct a switching test using 3–5 MPa pilot pressure to ensure crisp, non-sticking actuation.

4. After extended storage (exceeding 6 months), manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (5 MPa) under no load for 10 minutes before applying full load.